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通过MADD,CaSR通过Rab11A效应器连接内细胞和分泌通路,该效应器激活Rab27B

Jorge Eduardo Del-Río-Robles¹, Janik Adriana Tomás-Morales¹, Cesar Zavala-Barrera¹

¹Department of Cell Biology, Centro de Investigación y Estudios Avanzados del IPN (Cinvestav-IPN), Mexico City, Mexico.

Cellular signalling

|August 21, 2023

概括

感应受体 (CaSR) 通过将内细胞Rab11A与Rab27B介导的炎症因子分泌联系起来来控制细胞通信. 这一途径涉及特定的PI3-激酶,调节像IL-8和CCL2.2这样的分子的释放.

科学领域:

细胞生物学细胞生物学
分子信号传输的方法
免疫学免疫学免疫学

背景情况:

感应受体 (CaSR) 是C类G蛋白合受体 (GPCR),在调节细胞分泌通路方面发挥着至关重要的作用.
在CaSR下游的内细胞和分泌Rab GTPases之间控制通信的精确分子机制仍然不完全理解.
了解这些途径对于破译CaSR在炎症和化学反应中的作用至关重要.

研究的目的:

调查CaSR如何激活内细胞Rab11A依赖的效应因子通路,这些效应因子通路在Rab27B调节的分泌物上游起作用.
阐明CaSR刺激与特定炎症介质分泌之间的分子联系.

主要方法:

使用细胞测试研究了Rab11A在CaSR刺激的分泌中的作用.
利用生物化学方法来识别相互作用的蛋白质和信号分子,包括PI3-激酶 (Vps34,PI3KC2α) 和MADD.
研究了CaSR激活对细胞因子 (IL-8,CCL2/MCP-1,IL1-β,IL-6) 分泌的影响.

主要成果:

Rab11A对于促进IL-8,CCL2/MCP-1和IL1-β在对CaSR刺激的反应中依赖Rab27B的分泌是必不可少的.
CaSR刺激导致IL-6分泌的Rab11A介导衰减.
内体PI3-激酶 (Vps34,PI3KC2α) 调解Rab27B的激活,Rab11A与MADD相互作用并激活MADD,这是Rab3和Rab27A/B的关氨核酸交换因子.
通过MADD/Rab27B通路的内体PI3K依赖激活,CaSR信号对将内体循环回收到分泌囊泡中.

结论:

该CaSR利用Rab11A激活下游效应器,包括MADD和Rab27B,促进炎症媒介的分泌.
这项研究揭示了CaSR介导的对内分体与分泌囊泡合的新型控制机制,影响了炎症反应.
这些发现突出了Rab11A-MADD-Rab27B轴在CaSR信号和分泌中的关键作用.

关键词:

这就是CaSR CaSR.化学作用-细胞因子-分泌麦德德是个疯狂的人.这就是PI3-酶.拉布级联激活活动在Rab11A内分体中,内分体是拉布27B 是一个拉布27B.

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